工作面过旧采区时围岩结构及稳定性分析
Structure and Stability Analysis of Surrounding Rock During Working Face Crossing Old Mining Area
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摘要: 通过现场观测，研究了金鑫煤业3#煤层残采后的煤层赋存状态和顶板结构情况，煤柱的留存类型；根据残采后煤层赋存情况，总结出金鑫煤业复采区有4种顶板结构类型，利用数值模拟软件，对不同顶板条件下复采工作面顶板破坏情况及顶板应力作了系统分析，研究得出Ⅰ、Ⅱ型顶板条件下，影响复采面安全生产的主要因素是破碎顶板，Ⅲ、Ⅳ型顶板条件下，影响复采面安全生产的主要因素是顶板的垮落冲击作用力。Abstract: Through field observations, we studied the coal seam state, roof structure, retained coal pillar type of 3# coal seam in Jinxin Coal Industry after remaining coal mining. According to the state of the residual coal seam, we summarized that there are 4 kinds of roof structure types in the second mining area of Jinxin Coal Industry. With the numerical simulation software, we analyzed the roof destruction and the roof stress on the second mining working face under different roof conditions, and concluded that the breaking roof is the main factor influencing the safety production on the second mining face under the typeⅠ, Ⅱ roof conditions, while the roof caving impact force is the main factor under type Ⅲ,Ⅳ roof conditions.
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Keywords:
- the second mining /
- the roof type /
- numerical simulation /
- roof stress /
- surrounding rock structure /
- stability
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